Human Reproduction Update Advance Access originally published online on November 9, 2005
Human Reproduction Update 2006 12(3):209-232; doi:10.1093/humupd/dmi048
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HLA-G in human reproduction: aspects of genetics, function and pregnancy complications
Department of Clinical Biochemistry, Copenhagen University Hospital, Rigshospitalet and H:S Hvidovre Hospital, Copenhagen, Denmark
To whom correspondence should be addressed at: Department of Clinical Biochemistry, Roskilde University Hospital, 713 Køgevej, DK-4000 Roskilde, Denmark. E-mail: hviid{at}dadlnet.dk
Submitted on July 29, 2005; revised on September 27, 2005; accepted on October 4, 2005
The non-classical human leukocyte antigen (HLA) class Ib genes, HLA-E, -G and -F, are located on chromosome 6 in the human major histocompatibility complex (MHC). HLA class Ib antigens resemble the HLA class Ia antigens in many ways, but several major differences have been described. This review will, in particular, discuss HLA-G and its role in human reproduction and in the human MHC. HLA-G seems to be important in the modulation of the maternal immune system during pregnancy and thereby the maternal acceptance of the semiallogenic fetus. Recent findings regarding aspects of HLA-G polymorphism, the possible significance of this polymorphism in respect to HLA-G function and certain complications of pregnancy (such as pre-eclampsia and recurrent spontaneous abortions (RSA)) are discussed together with possible importance to IVF. Finally, aspects of a possible role of HLA-G in organ transplantation and in inflammatory or autoimmune disease, and of HLA-G in an evolutionary context, are also briefly examined.
Key words: gene expression / immunology / implantation / pregnancy / trophoblasts
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